Temperature indicator



B. HARRIS. TEMPERATURE INDICATOR. APPLICATION FILED JUNE 30, 1921.

l A 1 0,56? Patented Mar. 28, 1922.

wylim mA (i- 5 IMvENwIR iv/Wrong W.

I6 i gowah,

ens.

earner ensues.

BENJAMIN HARRIS, F PITTSBURGH, PENNSYLVANIA.

TEMPERATURE INDICATOR.

har est.

Specification-of Letters Patent,

Patented Mar. 28, 1922.

Application filed. June 30, 1921. Serial No. 481,617.

To all who m tt may comm:

Be it known that I, BENJAMIN HAnRIs, a citizen of the United States, resid ng at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Temperature Indicators, of which the following is a specification.

My invention relates to temperature indi jects appear hereinafter.

. Referring to the accompanying drawing,

. Fig. lis a side elevation of my invention,

Fig. 2, a central vertical section of the same, parts being in elevation; Fig. 3; a sectional detail showing the steam-escape valve and its operating means; and Fig. 4, a section of the glass cover or face plate. On the drawing, 1' designates a substantially circular orannular metal frame or casing having the lower or lateral extension 2 threaded externally at 3 to receive the threaded opening 4 of the radiator cap 5 which is threaded internally at 6 for connection with the ordinary externally threaded nipple (not shown) on the top of an automobile radiator. The extension 2 has the threaded opening 7 radial to the casing 1 and communicating with thefinterior'of the casing. A tube 8 is screwed into the opening 7 and projects somewhat beyond the free end of the extension 2.

9 is a helical spring coil of ribbon sheet: metal arranged in axial alinement with the axial center of the tube 8 and the center of the casing 1. The coil 9 extends somewhatbelow the outer end of the tube 8 and its lower end is connected by the metal strip 10 to the edge of the disk 11 secured to the spindle or pivot rod 12 whose lower end is mounted in a screw plug 15 in the bracket 13 attached to the inner face of the'tube 8 below the disk 11 and whose upper endis mounted in the inner end of the post 14 screwed into the casing 1 diametrically 0pposite to the opening 7. The rod 12 carries this cylinder or drum 16 whose periphery has a red portion 17 and a white portion'18. meeting on a spiral line 19 having only a part-of a whole turnextending from one end of the drum to the other.

20 is the casing for the coil screwed on'the tube 8. Its outer end has a central opening 21 communicating with the tube 22 hermetically sealed to the casing 20 around the opening 21. The casing 20 encloses the coil while the tube 22 extends inwardly within thecoil and has its inner end 23 closed. When the cap 5 is on a radiator, steam and .water cannot have access to the coil or the other movable mechanism described. 9

The casing 1 is provided with a glass cover or face plate 24 held thereon by the metal ring 25 secured to the casing by the screws 26. The cover 24 has on each face a pair of grooves 27 parallel with the drum 16 or its plvot rod 12 and coextensive with the length of the colored portion of the drum. On each face of the cover the glass 29 be tween the groovesis rounded transversely so that its cross-section is lens-shaped as shown at 28. The somewhat cylindrical portion 29 of the cover 24 serves to make the inclined line 19 appear substantially at right angles to the axis of the drum or substantially horizontal on an automobile radiator. The inner face of the cover is given a coat 30 which is impervious to light, and does not.

cover the glass portion 29.

One side of the casing 1 has the steam passage 31 which communicates with the interior of the cap 5 through the extension 2 as shown by the passage 32. The outer end of the passage 31 has an outlet through the valve-seat 33 on the casing at the side of the post 14. A lever'34 is carried by the pivot 35 in the outer end of the said post, oneend of the "-lever' carrying a alve 36 adapted to the seat 33 and the opposite end carrying a rod 37 extending into the casing 1 and having on its inner end the lug or hook 38 adapted'to be engaged and operated by the cam 39 on the rod12 above the cylinder 16. As shown on Fig. 3, the cam operates the valve only when the line 19 or the red indication 17 is at the top of the glass portion 29. The lever 34 and other described parts projecting beyond the casing 1 are surrounded by the metal casing 40 having the openplate 42 secured in place by the screws 43 which extend through the cover and-into ings 41 'and provided with the metal cover,

its seat 33.

The cap 5 is to be screwed on a radiator with the coil-casing 20 extending down toward the water in the radiator. As the water in the radiator becomes hotter and hotter, the heat from the water or steam or both passing throughthe casing 20 and tube 22 causes the coil 9 to expand. As the coil expandsit rotates'and causes the drum 16 to rotate. As the drum rotates the line 19, which appears to be substantially horizontal, rises behind the bulged glass portion 29. The cover glass 24 will contain suitable indicia giving visual notice of the temperature conditions of the water in the radiator, the indicia being opposite to the positions which the visual part of the line 19 occupies when the water has certain temperature conditions. When the water is at boiling temperature, the line 19 should be at the top of its range and the valve 36 should be unseated, allowing steam to escape through seat 33 and the openings 41, giving both visual and audible danger notices in addition to the notice due to highest position of the line 19.

1. In a temperature indicator for automobile radiators and the like, a casing, a rotary shaft supported thereby, a drum carried by the shaft and lying longitudinally thereof, a visual spiral turn on the drum, a metal coil arranged to be subjected to the temperature to beindicated, one end of the coil being fixed and the other end being connected to the shaft, a window carried by the casing and lying in front of, and parallel with, the drum.

2. In a temperature indicator for automobi-le radiators and the like, a casing, a rotary shaft supported thereby, a drum carried by the shaft and lying longitudinally thereof, a visual spiral turn on the drum, a metal coil arranged to be subjected to the temperature to be indicated, one end of the coil being fixed and the other end being connected to the shaft, a window carried by the casing and lving in front of, and parallel with, the

drum, the window comprising a strip ofgla'ss'lens-shaped in-cross-section.

3. In a temperature indicator for automobile radiators and the like, aicasing, a rotary shaft supported thereby, a drum carried by the shaft and lying longitudinally. thereof, a visual spiral turn on the drum, a metal coil arranged to be subjected to the temperatiire to be indicated, one end of the C011, being fixed and the other end being connected to theshaft, a window carried by the casing and lying in front of, and parallel with, the

drum, the window comprising a strip of of June, 1921.

glass double convex lens-shaped in crosssection. f I

4. In a temperature indicator for automobile radiators and the like, a casing, a rotary shaft supported thereby, a drum carried by v the shaft and lying longitudinally thereof, a visual spiral turn on the drum, a metal coil arranged to be subjected to the temperature to be indicated, 'one end of the coil being fixed and the other end being connected to the shaft, a window carried by the casing and lying in front of, and parallel, with, the drum: a steam outlet through the casing, a valve for closing the outlet, and means operated by the shaft when it has been rotated a predetermined angle for opening the valve.

5. In a temperature indicator for automobile radiators and the like, a casing, a rotary shaft supported thereby, a drum carried by the shaft and lying longitudinally thereof,

a visual spiral turn on the drum, a metal coil arranged to be subjected to the temperature to be indicated, one end of the coil being fixed and the other end being connected to the shaft, a window carried by. the casing and lying in front of, and parallel with, the drum, a steam outlet through the casing, a valve for closing outlet, means operated by the shaft when it has been rotated a predetermined angle for opening the valve, and a perforated casing carried by the first cas- 1 ing and enclosing the valve and steam outlet.

6. In a temperature indicator for automobile radiators and the like, a casing, a rotary Shaft supported thereby, a drum carried by the shaft and lying longitudinally thereof, a visual spiral turn on the drum, a metal coil arranged to be subjected to the temperature to be indicated, one end of the coil being fixed and the other end being connected to the shaft, a window carried by the casing and lying in frontof, and parallel with,the drum; and a signal operated by the shaft when it has rotated a predetermined angle.

7. In a temperature indicator, a casing, a rotary shaft carried thereby, a metal coil having its ends connected with the casing and the shaft, a casing enclosing the coil and having a steam and water tight fit with the first casing.

8. In a temperature indicator, a casing, a rotary shaft carried thereby, a metal coil having its end connected with the casing and the shaft, a casing enclosing the coil and havinga steam and water tight fit with the first casing, the outer end of the second casing having an opening and carrying internally a tube seated within the coil and having one end closed and the other end open and sealed to the outer end of the second casing around the said opening.

Signed at Pittsburgh, Pa., this 28th day 

